JPH047786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a formwork used for pouring a concrete slab in a structure made of stacked synthetic resin foam blocks.

(Prior Art) A construction method is currently being attempted in which foamed synthetic resin blocks are stacked on soft ground and a road is laid on top of them. According to this construction method, the lightweight nature of the foam blocks prevents ground subsidence and enables rapid construction.

The inventors have also proposed stacking foam blocks on the low-lying side of land with steps to reduce the horizontal earth pressure and make the retaining wall more upright, thereby improving the usability of the listing. Proposed.

(Problems to be Solved by the Invention) However, in the structure in which the foam blocks are stacked, it is necessary to ensure the integrity of the stacked foam blocks. That is, the higher the foam blocks are stacked, the more easily the stacked foam blocks collapse.

Therefore, in the stacked foam blocks, it is required to improve the stability of the stacked foam blocks by providing a layer of concrete slab for each layer of stacked foam blocks, and by providing a concrete slab on the top surface as well. Ru.

The concrete slabs to be installed on the middle and top surfaces will be poured on site depending on their size. Therefore, a formwork for concrete slabs is installed on top of the foam blocks and concrete is poured, but the formwork used at this time must not be able to shift its position during concrete pouring. . That is, since concrete is placed on lightweight foam blocks, there is a risk that the formwork and foam blocks may easily shift. Therefore, it is necessary to be able to easily fix the formwork and foam block. Furthermore, the stronger the connection between the formwork, concrete slab, and foam block by providing anchors, etc., the greater the effect of improving the integrity of the foam block.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a formwork used for pouring a concrete slab on the exposed or intermediate surface of a foam block structure, which prevents the concrete slab from shifting when pouring the concrete slab, The object of the present invention is to provide the formwork which is firmly connected to both blocks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

A main body made of a metal plate formed into a substantially L-shaped cross section and having a bottom plate and a front plate, a claw provided on the bottom plate of the main body and bent downward, and a bolt insertion hole provided in the bottom plate of the main body. The formwork is installed so that it butts against the edges of the foam blocks, and the nails of the bottom plate of the main body are bitten into the upper surfaces of the stacked foam blocks, and the adjacent formworks are connected via the connecting body. Adjacent formworks are connected by screwing connection bolts into the bolt insertion holes, a concrete slab is cast on the top surface of the foam block on which the formwork is installed, and the bolts are inserted into the concrete slab. Also serves as an anchor for
The present invention is constructed.

(Example) An example of the present invention will be described below in Figures 1 to 3.
This will be explained based on the diagram.

Although this example is a road embankment, it goes without saying that the foam block construction is not limited to this.

Referring to FIG. 3, foam blocks 2 are stacked on soft ground 1, and a road 3 is laid on top of the foam blocks 2. Due to the lightweight nature of the foam block 2, ground subsidence can be prevented.

Concrete slabs 6 are cast on site on the exposed surface 4 and middle surface 5 of the foam block 2 to stabilize the foam block 2, but formwork 8 is installed in line with the outer end surface 7 of the foam block 2. There is.

This construction is performed as follows.

A concrete block 9A is installed, and a permeable sandy soil layer 10 is laid thereon. Foam blocks 2 are stacked on top of this sandy soil layer 10. Here, the foamed block 2 is a block molded product of synthetic resin such as foamed polystyrene, foamed polyethylene, foamed urethane, etc., and foamed polystyrene (styrene foam) is particularly preferred because it is inexpensive.

The foam blocks 2 are tightly connected to each other by a fastener 11 to improve their integration. The fastening tool 11 is formed by bending a claw 12 around a metal plate.
2 is wedged into the adjacent foam block 2.

List 4 and intermediate surface 5 of stacked foam blocks 2
, the formwork 8 is attached to the outer end surface 7 of the foam block 2.
concrete slab 6 is poured on site. This will be explained in detail later.

At the boundary between the foam block 2 and the earth pressure acting end surface 13, a mixture of natural earth and sand and foam particles of synthetic resin is used as the foam block backfilling material 14. This is to eliminate the inconvenience caused by the difference in the soil quality of the earth pressure acting end face 13 and the properties of the foam block 2.

A concrete block 9B is installed on the outer end surface 7 of the concrete slab 6 on the top surface 7, and bolts 1
Fixed by 5.

A permeable sandy soil layer 16 is laid thereon, and a road 3 paved with concrete or asphalt is laid thereon. The upper concrete block 9B is the same as the lower concrete block 9A, and is installed upside down.

A cover 17 made of a corrugated iron plate is fixed with bolts 18 and 19 between the upper concrete block 9B and the lower concrete block 9A.
This cover 17 covers the foam block 2,
This prevents the foam block 2 from deteriorating by preventing it from being exposed to ultraviolet rays.

Drainage from the upper sandy soil layer 16 coming out of the drain 20 of the upper concrete block 9B falls through the gap between the foam block 2 and the cover 17. Then, the water flows down through the foam block backfilling material 14 and is discharged to the outside from the drain 21 of the concrete block 9A below, together with the waste water that has permeated the sandy soil layer 10 below.

Concrete slabs 6 are placed on the exposed surface 7 and intermediate surface 5 of the foam blocks 2 stacked as described above. This is to ensure the mutual integrity of the foam blocks 2 and to provide support for the load of automobiles traveling on the road 3.

The concrete slab 6 and formwork 8 will be explained in detail with reference to FIGS. 1 and 2.

The main body 22 of the formwork 8 for pouring the concrete slab 6 is formed from a metal plate such as an iron plate and has a substantially L-shaped cross section, and has a bottom plate 23 and a front plate 24. The slope of the front plate 24 is made to match the slope of the stacked foam blocks 2. Triangular pointed portions are formed on the edges near both ends of the bottom plate 23, and these are bent downward to form claws 25. Additionally, bolt insertion holes 26 are provided near both ends of the bottom portion 24.
is provided.

This formwork 8 is placed against the outer end surface 7 of the stacked foam blocks 2. Claw 2 of bottom plate 23
5 bites into the upper surface of the foam block 2.
Also, bolt insertion holes 26 between adjacent formworks 8
A connecting body 27 made of band iron with holes for bolt insertion in two places is placed in the frame 8, and connecting bolts 28 are screwed into the bolt insertion holes 26 of the adjacent formwork 8 from below through this connecting body 27. formwork 8 is connected.

After the formwork 8 is installed, concrete is placed on the 2 faces of the foam blocks to form the concrete slab 6. As shown above, the claw 25 is made of foam block 2.
Since it bites in, the position of the formwork 8 will not shift during installation of the formwork 8 and pouring of concrete.

By using a longer connecting bolt 28,
The connecting bolt 28 serves as an anchor for the concrete slab 6.

Since the claws 25 are biting into the foam block 2 and the concrete slab 6 and the formwork 8 are connected by the connecting bolts 28, the foam block 2 and the concrete slab 6 are firmly connected via the formwork 8. becomes.

In this embodiment, mortar 30 is filled in the borehole 29 of the earth pressure acting surface 13, and the borehole 29 is filled with mortar 30.
and an anchor 31 made of a steel rod on the concrete slab 6
Both ends of the foam block 2 are fixed to improve stability of the foam block 2.

However, the present invention is not limited to the above embodiments.
For example, foam block structures to which the present invention is applied are not limited to embankments, but also retaining walls that utilize the self-supporting properties of stacked foam blocks, or structures in which foam blocks 2 are placed on the side of the structure and soil that acts on the structure is used. It is used in a broad sense, including things designed to reduce pressure.

(Effects of the Invention) In the present invention, the claws of the formworks bite into the foam blocks, and the connecting bolts are screwed into adjacent formworks via the connecting bodies, thereby connecting the formworks to each other. Therefore, the position of the formwork will not shift when concrete slabs are placed.

Furthermore, since the connecting bolts also serve as anchors for the concrete slab, the formwork and the concrete slab are strongly connected.

In addition, the claws are biting into the foam block, and the concrete slab and formwork are strongly connected by the connecting bolts, so the foam block and concrete slab are firmly connected via the formwork, and the foam block The unity of the two will be greatly improved.

The claws are integrally formed at the bottom of the formwork, and the connecting bolts for connecting the formworks also serve as anchors, making the structure simple and inexpensive.

[Brief explanation of drawings]

FIG. 1 is an installation perspective view of a formwork according to an embodiment of the present invention. FIG. 2 is a side view of FIG. 1. FIG. 3 is a cross-sectional view of the foam block structure. 2: Foam block, 6: Concrete plate, 7:
Outer end surface, 8: Formwork, 22: Main body, 23: Bottom plate,
24: Bottom plate, 25: Claw, 27: Connecting body, 28: Connecting bolt.

Claims (1)

[Claims] 1. In a foam block construction in which foam blocks are stacked to reduce earth pressure,
A formwork consisting of a main body made of a metal plate formed by bending a bottom plate and a front plate, a claw provided in the bottom plate of the main body and bent downward, and a bolt insertion hole provided in the bottom plate of the main body. The bent portion of the formwork is installed so as to butt against the outer end surface of the foam block, and the claws formed on the bottom plate of the main body are bitten into the upper surface of the stacked foam blocks, and the adjacent foam blocks are connected via a connecting body. Adjacent formworks are connected by screwing connecting bolts into the bolt insertion holes of the formworks, and a concrete slab is placed on the top surface of the foam block on which the formworks are installed, and the connection is completed. A formwork for a concrete slab of a foam block construction, characterized in that bolts also serve as anchors for the concrete slab.